Products disappear off the shelves due to low demand or companies going out of business. My guess is that the Saniflush (I remember this, too - it had a center cap that you had to pry off) formula was pushed out by easier-to-use products that were less messy (I remember sweeping up crystals off of my floors) such as the liquids with the angled spouts for getting under the rim. Want a great alternative? See if you can find "The Works" toilet bowl cleaner - I have very hard water and this is the only product I've found that will get rid of the brown stain my water leaves on the bowl - but I do have to let it sit overnight.
